Andrew E. LaMotteMichael E. Wieczorek2010National Land Cover Database 2001 (NLCD01) Imperviousness Layer Tile 4, Southeast United States: IMPV01_4Version 1raster digital dataData SeriesDS-587DBaltimore, MarylandU.S. Geological Surveyhttps://water.usgs.gov/lookup/getspatial?impv01_4This 30-meter resolution data set represents the imperviousness layer for the conterminous United States for the 2001 time period. The data have been arranged into four tiles to facilitate timely display and manipulation within a Geographic Information System, browse graphic: nlcd01-partition. The National Land Cover Data Set for 2001 was produced through a cooperative project conducted by the Multi-Resolution Land Characteristics (MRLC) Consortium. The MRLC Consortium is a partnership of Federal agencies (www.mrlc.gov), consisting of the U.S. Geological Survey (USGS), the National Oceanic and Atmospheric Administration (NOAA), the U.S. Environmental Protection Agency (USEPA), the U.S. Department of Agriculture (USDA), the U.S. Forest Service (USFS), the National Park Service (NPS), the U.S. Fish and Wildlife Service (USFWS), the Bureau of Land Management (BLM), and the USDA Natural Resources Conservation Service (NRCS). One of the primary goals of the project is to generate a current, consistent, seamless, and accurate National Land Cover Database (NLCD) circa 2001 for the United States at medium spatial resolution. For a detailed definition and discussion on MRLC and the NLCD 2001 products, refer to Homer and others (2004) and http://www.mrlc.gov/mrlc2k.asp.. The NLCD 2001 was created by partitioning the United States into mapping-zones. A total of 68 mapping-zones browse graphic: nlcd01-mappingzones.jpg were delineated within the conterminous United States based on ecoregion and geographical characteristics, edge-matching features, and the size requirement of Landsat mosaics. Mapping-zones encompass the whole or parts of several states. Questions about the NLCD mapping zones can be directed to the NLCD 2001 Land Cover Mapping Team at the USGS/EROS, Sioux Falls, SD (605) 594-6151 or mrlc@usgs.gov.To provide complete, current, and consistent public domain information of national land use and land cover. This national (conterminous United States) data set was developed for use by the U.S. Geological Survey's National Water-Quality Assessment (NAWQA) Program. NAWQA uses land-use data to assess land-use change, such as urban development and loss of agricultural lands as well as to allocate nutrient and pesticide loads to particular land-use categories.The data is stored in four tiles (IMPV01_1, IMPV01_2, IMPV01_3, IMPV01_4) browse graphic: nlcd01-partitions.jpg to allow for storage using the ArcInfo Workstation GRID data model, which cannot support files larger than 2.1 gigabytes. Each tile has been stored as a gzipped ARCTAR file. To extract the ArcInfo Workstation GRID from the .tgz archive file use WINZIP, TARARC, or the following commands: "gunzip tilename.tgz" then "tar xvof tilename.tar".
Questions about the NLCD mapping of any zone can be directed to the NLCD 2001 Land Cover Mapping Team at the USGS's Earth Resources Observation and Science (EROS) Center, Sioux Falls, SD by telephone (605) 594-6151 or by email (mrlc@usgs.gov).
The method employed to map percent imperviousness for NLCD 2001 consists of three key steps: deriving reference data of imperviousness from the high spatial resolution images, calibrating density prediction models using reference data and Landsat spectral bands, and extrapolating the developed models spatially to map per-pixel imperviousness. This method is described in detail in Yang and others (2003).
The development of training data for impervious estimation is documented in each mapping-zone's metadata file.
Each downloadable multi-zone image layer browse graphic: nlcd01-multizones.jpg is comprised of merged multiple mapping-zones browse graphic: nlcd01-mappingzones. Each mapping-zone has its own metadata that can be found in the appropriate mapping-zone metadata directory that is created when the downloaded multizone file is decompressed. The metadata for mapping-zone 01 would be located under the directory area1_landcover_metadata\zone1_impervious_meta_web_final (where "area1" is the same as "Multi-zone 1" and "zone1" is "mapping-zone 01").The organization of multi-zones and mapping-zones for TILE 4 is as follows: Multi-zone 9 contains mapping-zones 38, 43, 44; Multi-zone 10 contains mapping-zones 32, 35, 36, 37a, 37b; Multi-zone 11 contains mapping-zones 47, 49, 52, 53, 62; Multi-zone 12 contains mapping-zones 37b, 45, 46a, 46b, 48; Multi-zone 13 contains mapping-zones 60, 61; Multi-zone 14 contains mapping-zones 54, 55, 56, 57, 58, 59.
Original Data Creation Listing:
Multi-zone 9
Mapping-zone 38: USGS, Sanborn Mapping Company.
Mapping-zone 43: USGS, MDA Federal Inc.
Mapping-zone 44: USGS, Sanborn Mapping Company.
Multi-zone 10
Mapping-zone 32: USGS, MDA Federal Inc.
Mapping-zone 35: USGS, Sanborn Mapping Company.
Mapping-zone 36: USGS, USDA Forest Service.
Mapping-zone 37a: USGS, USDA Forest Service.
Mapping-zone 37b: USGS, USDA Forest Service.
Multi-zone 11
Mapping-zone 47: USGS, Space Imaging LLC.
Mapping-zone 49: USGS, Sanborn Mapping Company.
Mapping-zone 52: USGS, Sanborn Mapping Company.
Mapping-zone 53: USGS, Space Imaging LLC.
Mapping-zone 62: USGS, Sanborn Mapping Company.
Multi-zone 12
Mapping-zone 37b: USGS, USDA Forest Service.
Mapping-zone 45: USGS, Sanborn Mapping Company.
Mapping-zone 46a: USGS, USDA Natural Resources Spatial Analysis Laboratory at the University of Georgia.
Mapping-zone 46b: USGS, USDA Natural Resources Spatial Analysis Laboratory at the University of Georgia.
Mapping-zone 48: USGS, USDA Natural Resources Spatial Analysis Laboratory at the University of Georgia.
Multi-zone 13
Mapping-zone 60: USGS, Earth Satellite Corporation.
Mapping-zone 61: USGS, MDA Federal Inc.
Multi-zone 14
Mapping-zone 54: USGS, USDA Natural Resources Spatial Analysis Laboratory at the University of Georgia.
Mapping-zone 55: USGS, USDA Natural Resources Spatial Analysis Laboratory at the University of Georgia.
Mapping-zone 56: USGS, USDA Forest Service.
Mapping-zone 57: USGS, USDA Natural Resources Spatial Analysis Laboratory at the University of Georgia.
Mapping-zone 58: USGS, USDA Natural Resources Spatial Analysis Laboratory at the University of Georgia.
Mapping-zone 59: USGS, USDA Natural Resources Spatial Analysis Laboratory at the University of Georgia.
2001publication dateCompleteAs needed-98.182478-69.94705639.89297122.983872NoneNational Water-Quality AssessmentNAWQAland coverland useNational Land Cover Data SetNLCDInlandwatersImperviousnessNoneConterminous United StatesNoneUsers should refer to the metadata for each mapping zone for use constraints that may be unique to each zone.Andrew LaMotteU.S. Geological Surveymailing and physical address5522 Research Park DriveBaltimoreMaryland21228USA443-498-5549443-498-5510alamotte@usgs.govMonday through Friday, 9:00 am - 5:00 pm ESTemailhttps://water.usgs.gov/GIS/browse/impv01_4.jpgImperviousness Layer Tile 4, Southeast United StatesJPGU. S. Geological SurveyMicrosoft Windows Vista Version 6.1 (Build 7600) ; ESRI ArcCatalog 9.3.1.3500U.S. Geological Survey2001National Land Cover Data set (NLCD 1992)raster digital datahttp://eros.usgs.gov/#/Find_Data/Products_and_Data_Available/NLCD_92U.S. Geological SurveyNakagaki, NaomiPrice, Curtis V.Falcone, James A.Hitt, Kerie J.Ruddy, Barbara C.2007Enhanced National Land Cover Data 1992 (NLCDe 92)1.0, 2005Raster digital datahttps://water.usgs.gov/lookup/getspatial?nlcde92U.S. Geological SurveyHitt, Kerie J.2006National Land Cover Data Set (Enhanced with GIRAS then revised with 1990 and 2000 Population) - "NLCDEP"Version 3, March 2006 (Replaces Version 2, Sept 2005)Raster digital data Yang, L., Huang, C., Homer, C., Wylie, B., and Coan, M.2003An approach for mapping large-area impervious surfaces: Synergistic use of Landsat 7 ETM+ and high spatial resolution imagery. Canadian Journal of Remote Sensing, v. 29: no. 2, p. 230-240. v. 29: no. 2, p. 230-240.Homer, C., Huang, C., Yang, L., Wylie, B., and Coan, M.2004Development of a 2001 national land cover database for the United States: Photogrammetric Engineering and Remote Sensing, v. 70, no. 7, p. 829 - 840, or online at http://www.mrlc.gov/publications.php v. 70, no. 7, p. 829 - 840 http://www.mrlc.gov/publications.phpESRI feature type: Geometry, TopologyComplete for conterminous United StatesMulti-zone zipped image files were downloaded from the MRLC multi-zone web site http://www.mrlc.gov/index.asp on May 21, 2007. Image header files were then built partly based on the format supplied by the USGS LCI (Land Cover Institute) from the web site http://landcover.usgs.gov/faq.php; the exact parameters are shown below. Left longitude and top latitude extents were obtained for each image by reading the source information in ArcGIS. Images were then converted to raster data sets using the IMAGEGRID command in Arc workstation. The command PROJECTDEFINE was then applied to each multi-zone grid for proper display and projection definition. The resulting raster data sets were then merged together using the national tile configuration previously established by NAWQA for NLCD, NLCDe, and NLCDeP. Tiles were assembled by using the SETWINDOW command with the NAWQA tiles as SNAP grids for proper alignment with the other national data sets.
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Tile 4 Contains all or parts of the following multi-zones and their respective mapping-zones.
Multi-zone 9: mapping-zones 38, 43, 44;
Multi-zone 10: mapping-zones 32, 35, 36, 37a, 37b;
Multi-zone 11: mapping-zones 47, 49, 52, 53, 62;
Multi-zone 12: mapping-zones 37b, 45, 46a, 46b, 48;
Multi-zone 13: mapping-zones 60, 61;
Multi-zone 14: mapping-zones 54, 55, 56, 57, 58, 59;
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Example of a header file for Multi-zone 1
BYTEORDER M
LAYOUT img
NROWS 31326
NCOLS 26024
NBANDS 1
NBITS 8
SKIPBYTES 0
ULXMAP -2303835
ULYMAP 3180435
XDIM 30
YDIM 30
******************************************************************************************2007Andrew LaMotteU.S. Geological Surveymailing and physical address5522 Research Park DriveBaltimoreMaryland21228USA443-498-5549443-498-5510alamotte@usgs.govMonday through Friday, 9:00 am - 5:00 pm ESTemailRasterGrid Cell53833816661Albers Conical Equal Area29.50000045.500000-96.00000023.0000000.0000000.000000row and column30.00000030.000000metersNorth American Datum of 1983Geodetic Reference System 806378137.000000298.257222
impv01_1.vatValue attribute table.ESRI - Entity Attribute Overview Description.RowidInternal feature number.ESRISequential unique whole numbers that are automatically generated.ValuePercent ImperviousnessNLCD 20010100PercentageCountCount is the total number of cells in a grid for each unique value.CalculatedSequential unique whole numbers that are automatically generated.100Derived number of grid cells.As neededU.S. Geological SurveyAsk USGS -- Water Webserver Teammailing address445 National CenterRestonVA201921-888-275-8747 (1-888-ASK-USGS)https://water.usgs.gov/user_feedback_form.htmlDownloadable DataAlthough this data set has been used by the U.S. Geological Survey, U.S. Department of the Interior,
no warranty expressed or implied is made by the U.S. Geological Survey as to the accuracy of the data
and related materials. The act of distribution shall not constitute any such warranty, and no responsibility is
assumed by the U.S. Geological Survey in the use of this data, software, or related materials. Any use of trade,
product, or firm names is for descriptive purposes only and does not imply endorsement by the U.S. Government.
Although this Federal Geographic Data Committee-compliant metadata file is intended to document the data set in nonproprietary form, as well as in ArcInfo format, this metadata file may include some ArcInfo-specific terminology.ARC INFO GRID1.0gzipped arctar filePercentage imperviousness raster data for souththeast quadrant of the United Statesgunzip then use tar -xvf IMPV01_4.tar, or use WinZip233,370https://water.usgs.gov/GIS/dsdl/impv01_4.tar.gzNot specifiedTIFF1.0tifPercentage imperviousness raster data for southeast quadrant of the United Stateswinzip157,970https://water.usgs.gov/GIS/dsdl/impv01_4.tif.zipNot specifiedNone, this data set is provided by the USGS as a public service.2010U.S. Geological SurveyAsk USGS Water Webserver Teammailing address445 National CenterRestonVirginia20192USA1-888-275-8747 (1-888-ASK-USGS)https://answers.usgs.gov/cgi-bin/gsanswers?pemail=h2oteam&subject=GIS+Dataset+impv01_4Monday through Friday, 9:00 am - 5:00 pm ESTFGDC Content Standards for Digital Geospatial MetadataFGDC-STD-001-1998